Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/29f36656d15f
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #19438 from etiennesegonzac/bug-1009963

Bug 1009963 - Making sure the fullscreen status bar panel doesn't steal focus r=21

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https://hg.mozilla.org/integration/gaia-1_4/rev/54d02fba1349
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19429 from viorelaioia/bug_1010768

[v1.4] Bug 1010768 - Intermittent fail of test_settings_cell_data.py

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https://hg.mozilla.org/integration/gaia-1_4/rev/ad80fc3826fd
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: [v1.4] Bug 1010768 - Intermittent fail of test_settings_cell_data.py
Bumping manifests a=b2g-bump